How do you unlock the 21 levels? I've gotten 4 from stage 1, 4 from stage 2, 4 from stage 3, 3 from the December 11, and Prologue, and Epilogue. That's only 17. I've gotten the rabbit ending, and if you're counting those, that only equals to 19 at most.
Sorry for the late reply. If you saw the rabbit ending then you have completed all stages. The total number of normal stages and the rabbit marked stages should be 21 levels.
